How can you search for an unset value?

[tal-zvon]

Trying to get the default route on the router in the main routing table.
Can't figure out how to tell .get() that I'm looking for an item where the routing_mark field is unset.

#!/usr/bin/env python3

import routeros_api

args = {
	"host": "1.2.3.4",
	"username": "admin",
	"password": "PASSWORD",
        ...
}

api_connection = routeros_api.RouterOsApiPool(**args)
api = api_connection.get_api()

routes = api.get_resource("/ip/route")
default_route = routes.get(dst_address="0.0.0.0/0", disabled="no", routing_mark=None)

None doesn't work. "none" doesn't seem to work either. Is there a way to do this?

[memost]

resolve this is simple
just add 2 lines in resourse.py in class RouterOsBinaryResource(object):
sowhere around def set(self, **kwargs):

    def unset(self, **kwargs):
        return self.call('unset', kwargs)

it is like 'set' but calling "unset". working fine for me